African violets can be propagated by removing a leaf and planting it in moist potting soil.

Spring and early summer are good times to make leaf cuttings. Cut off a center leaf (with about an inch and a half of the stem attached) and insert the stem upright into the soil just to the start of the leaf. (Set the back of the leaf towards the back of the pot, to help support it.) Set it in a bright location out of direct sun and keep the soil barely moist and maintain humidity until new growth appears from the leaf. Then repot your new little plant. It might take a month or so to have aplantlet big enough to handle.

Another easy method, if your plant is overcrowded and has multiple crowns, is to remove it from the pot and gently separate the crowns, planting each in its own pot.